Digital Signature
Problem 290
Published on Friday, 30th April 2010, 05:00 pm; Solved by 577How many integers 0 
n < 1018 have the property that the sum of the digits of n equals the sum of digits of 137n?
How many integers 0 n < 1018 have the property that the sum of the digits of n equals the sum of digits of 137n?